#define _CRT_SECURE_NO_WARNINGS 1 

#include<iostream>
#include<cstring>
#include<algorithm>

using namespace std;

const int N = 510, M = 100010;
int n1, n2, m;
int h[N], e[M], ne[M], idx;
int match[N];
bool st[N];

void add(int a, int b)
{
	e[idx] = b; ne[idx] = h[a]; h[a] = idx++;
}
bool find(int x)
{
	for (int i = h[x]; i != -1; i = ne[i])
	{
		int j = e[i];
		if (!st[j])
		{
			st[j] = true;
			if (match[j] == 0 || find(match[j]))
			{
				match[j] = x;
				return true;
			}
		}
	}
	return false;
}

int main()
{
	cin >> n1 >> n2 >> m;
	memset(h, -1, sizeof h);
	while (m--)
	{
		int a, b;
		cin >> a >> b;
		add(a, b); 
	}

	int res = 0;
	for (int i = 1; i <= n1; i++)
	{
		memset(st, false, sizeof st);
		if (find(i)) res++;
	}
	cout << res << endl;
	return 0;
}
